Last change
on this file since 351 was 337, checked in by coas-nagasima, 6 years ago |
ASP3版ECNLを追加
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Property svn:eol-style
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native
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Property svn:mime-type
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File size:
1.5 KB
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1 | #include "libm.h"
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2 |
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3 | #if LDBL_MANT_DIG == 53 && LDBL_MAX_EXP == 1024
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4 | long double nextafterl(long double x, long double y)
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5 | {
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6 | return nextafter(x, y);
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7 | }
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8 | #elif LDBL_MANT_DIG == 64 && LDBL_MAX_EXP == 16384
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9 | long double nextafterl(long double x, long double y)
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10 | {
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11 | union ldshape ux, uy;
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12 |
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13 | if (isnan(x) || isnan(y))
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14 | return x + y;
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15 | if (x == y)
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16 | return y;
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17 | ux.f = x;
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18 | if (x == 0) {
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19 | uy.f = y;
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20 | ux.i.m = 1;
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21 | ux.i.se = uy.i.se & 0x8000;
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22 | } else if ((x < y) == !(ux.i.se & 0x8000)) {
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23 | ux.i.m++;
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24 | if (ux.i.m << 1 == 0) {
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25 | ux.i.m = 1ULL << 63;
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26 | ux.i.se++;
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27 | }
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28 | } else {
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29 | if (ux.i.m << 1 == 0) {
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30 | ux.i.se--;
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31 | if (ux.i.se)
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32 | ux.i.m = 0;
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33 | }
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34 | ux.i.m--;
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35 | }
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36 | /* raise overflow if ux is infinite and x is finite */
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37 | if ((ux.i.se & 0x7fff) == 0x7fff)
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38 | return x + x;
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39 | /* raise underflow if ux is subnormal or zero */
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40 | if ((ux.i.se & 0x7fff) == 0)
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41 | FORCE_EVAL(x*x + ux.f*ux.f);
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42 | return ux.f;
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43 | }
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44 | #elif LDBL_MANT_DIG == 113 && LDBL_MAX_EXP == 16384
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45 | long double nextafterl(long double x, long double y)
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46 | {
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47 | union ldshape ux, uy;
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48 |
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49 | if (isnan(x) || isnan(y))
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50 | return x + y;
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51 | if (x == y)
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52 | return y;
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53 | ux.f = x;
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54 | if (x == 0) {
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55 | uy.f = y;
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56 | ux.i.lo = 1;
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57 | ux.i.se = uy.i.se & 0x8000;
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58 | } else if ((x < y) == !(ux.i.se & 0x8000)) {
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59 | ux.i2.lo++;
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60 | if (ux.i2.lo == 0)
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61 | ux.i2.hi++;
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62 | } else {
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63 | if (ux.i2.lo == 0)
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64 | ux.i2.hi--;
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65 | ux.i2.lo--;
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66 | }
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67 | /* raise overflow if ux is infinite and x is finite */
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68 | if ((ux.i.se & 0x7fff) == 0x7fff)
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69 | return x + x;
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70 | /* raise underflow if ux is subnormal or zero */
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71 | if ((ux.i.se & 0x7fff) == 0)
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72 | FORCE_EVAL(x*x + ux.f*ux.f);
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73 | return ux.f;
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74 | }
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75 | #endif
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